Yank,
I fly VFR, mostly locally and I update my 430 once a year. It costs around $130. You still need the Skybound and Jeppesen Services software on your computer, and you'll need to call Jepp on the phone. After you give them a CC they'll make the download available using the software mentioned above.
Alternatively, you can buy a populated datacard for quite a bit less with either the current charts or month old charts on ebay or the various classified sections of this forum and others. Some guys buy the annual subscription and sell every other month, easily getting their money back for the year.